If your skin is sensitive or you are new to tar-based cleansers, a cautious introduction is advised. Begin by using the soap just once a day, or even every other day, for the first week or two. Use a small amount on your body or hands, avoiding the delicate eye area entirely. Pay close attention to how your skin feels after rinsing and drying. A clean, fresh feeling is the goal. If you notice any signs of irritation—such as pronounced redness, stinging, tightness, or dryness—discontinue use. For individuals with conditions like eczema, psoriasis, or very dry skin, it's wise to consult a dermatologist before incorporating a new active cleanser into your routine, as birch tar can be too strong for some skin types.